More than nine out of 10 British universities pay their average male employee more than they pay their average female employee.
Nearly all government departments and almost two-thirds of local councils also have pay gaps, based on data given to the Government Equalities Office.
Saturday is the last day for public sector bodies with more than 250 staff in Britain to disclose their figures.
Private sector companies have one more week, until 4 April.
But with the deadline looming, thousands have yet to file, as many wait until the last moment. Last year, half of all companies reported in the final week.
This is the second year that both public and private sector companies have been required to report their gender pay gap figures.
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